print((function (f)
	return f()==f() and "YES" or "NO"
end)((function (M)
	local C,CB = M.C,M.cast("int(*)(const char *,const char *)",function (a,b) return a[0]-b[0] end)
	M.cdef 'void qsort(void *,size_t,size_t,int(*)(const void *,const void *));'
	return function ()
		local s=io.stdin:read("*l")
		local c=M.new("char[?]",#s+1,s)
		C.qsort(c,#s,1,CB)
		return M.string(c)
	end
end)(require'ffi')))